GODAE Status. OSEs/OSSEs meeting objectives. P.Y. le Traon, A. Fischer, E. Harrison, K. Wilmer Becker

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1 GODAE Status OSEs/OSSEs meeting objectives P.Y. le Traon, A. Fischer, E. Harrison, K. Wilmer Becker

2 Content 3. GODAE Status Achievements and successes Priorities GODAE in 2007/ Objectives of the OSEs/OSSEs meeting Background Meeting organization

3 The Global Ocean Data Assimilation Experiment The Mission for GODAE A practical demonstration of the feasibility & utility of high-resolution, global analyses & short-range forecasts of 3D temperatures, salinities and currents Global operational oceanography Timetable Conceptual development Prototype development Operational demonstration & consolidation

4 Achievements and Successes Implementation of observing and data processing system Argo, altimetry, GHRSST-PP, in-situ Implementation of global modelling and data assimilation capabilities Implementation of data and product serving capabilities and standardization Intercomparison / validation, metrics and standardization Demonstrations of feasibility and utility Mesoscale nowcasting and forecasting, ocean climate and research, marine pollution and safety, weather forecasting, marine resources, etc Scientific advances - Modelling, data assimilation, scientific validation

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6 The pre-godae in-situ ocean observing system was clearly inadequate for the global scope of GODAE => Argo : a joint GODAE/CLIVAR pilot project. Outstanding progress thanks to international cooperation. A global array (3000 floats) is now in place! An efficient data management system is in place. Main issue is long term sustainability A specific focus for this workshop

7 GODAE SST need = Global high resolution in time (< 1 day) and space (<10 km) = A specific GODAE pilot project Regional Data Assembly Centres (RDAC) China? RDAC Excellent progress : efficient activation through regional data assembly centres (RDAC); international cooperation, new high resolution global and regional products (L2P, L4) RDAC RDAC RDAC SST data products (L2P, L4) Global High Resolution SST pilot project (GHRSST) combination of data from various sources modern data serving entrain scientific expertise for quality products RDAC Ingestion, Dissemination and Processing Service (IDPS) Global Data Analysis Centre (GDAC) Product Rolling Archive Metadata repository (MMR) HR-DDS archive USA EU Global L4 analysis systems Global coverage L4 SST products GHRSST-PP Long Term Reanalysis and data Stewardship Facility (LTSRF) Historical time series SST CDR products / Matchup database (MDB)

8 Implementation: Forecast systems National systems involving research & operational institutes BlueLink Australia Canadian consortium NLOM and NCOM - USA HYCOM consortium - USA Move & COMPASS-K systems Japan MERCATOR France MFS - Italy NCOF consortium (FOAM) UK TOPAZ - Norway European coordination MERSEA consortium

9 GODAE Priorities GODAE demonstration Establish and consolidate base-line systems (GODAE standards). Demonstrations of Impact/Utility = main focus of GODAE. Develop a series of «good» examples of GODAE successes (from observations to users). GODAE products Error characterisation: consolidate work on metrics and intercomparison ( GODAE label ). Make sure a minimum set is internationally implemented. Develop product standardization. Ensure interoperability between systems. Observing Systems Use the experiment for an improved design of the observing system. Provide clear demonstration of added value and impact on applications. Promote results (space agencies, GMES, GEOSS). Transition : from demonstration to operational systems Work with JCOMM, IOC and GOOS on the transition Promote examples of transition to operational systems for the different nations Contribute to the definition of operational oceanography architecture New projects/initiatives : coastal and ecosystems Develop links with IMBER (ecosystems from low to high trophic levels). Initiate a specific coastal project (downscaling).

10 The GODAE IMBER initiative (Ecosystem modelling) At the first GODAE-IMBER Meeting at CNRS (12-13 June 2007) a new working group has been formed to facilitate dialogue between those developing new ecosystem models and the developers of the operational systems. Particular emphasis is given to: 3. Improvement of present GODAE systems for IMBER - ocean analysis / reanalysis products - intercomparisons (global & regional) - forcing fields 8. Improvement of the observing system - new sensors/measurements - joint physical/biological data assimilation 12. Use of GODAE products by IMBER - bio-ecosystem reanalysis - Multi model ensembles Areas of importance Ecosystem modelling & data assimilation - Schemes for assimilation of biogeochemical data are under development - Current assimilation schemes degrade the biogeochemistry - Overall high horizontal and vertical resolution models for the upper ocean are needed. - Advanced schemes for a finer vertical structure are a key issue for nutrient transport. Interaction with coastal and shelf seas systems Support for B-Argo (see friends of Oxygen on Argo) Reanalysis Meeting outcomes available on GODAE WWW site

11 Advance: The GODAE Coastal and Shelf Seas Working group (CSSWG) The usefulness of GODAE systems to coastal and shelf seas forecasting will be one of the measures of the success of GODAE. The mission of the GODAE CSSWG is to define, monitor and promote actions, within GODAE, aimed at the assessment and demonstration of the value of GODAE results for regional, coastal and shelf seas models and forecasting systems Position paper "Towards the assessment and demonstration of the value of GODAE results for coastal and shelf seas models and forecasting systems" P. De Mey, ed., 74pp GODAE Coastal workshop, Liverpool, UK, October: GODAE Coastal workshop, planned in Newfoundland, Canada

12 GODAE activities in 2007/2008 Four workshops in 2007 (preparation of final conference) IMBER/GODAE Summer 2007 (done) OSSEs/OSEs Observing system (GODAE/OOPC) GODAE Coastal workshop in Fall 2007 (done) and mid 2008 Links with GSOP/CLIVAR (September 2007) Intercomparison experiment (Spring 2008) IGST meeting, Canada, August 2007 and June 2008 Final conference in Fall 2008 jointly held with OSTM meeting + Argo November 2nd week, Nice TBC) Special journal issue on GODAE achievements Oceanography Magazine mid 2009 based on final conference synthesis papers 2nd summer school in Spring 2009 (Australia) Preparing the future of GODAE (IOC, GOOS, JCOMM) to be defined Technical issues JCOMM (operation, standards, validation, metrics) International coordination/science issues ecosystem, coastal, observing system assessment and design (methodology, recommandations),

13 GODAE/OOPC OSEs/OSSEs meeting Background The GODAE requirements for an initial global observing system have been described in the OceanObs99 conference book (updated in GCOS reports). Primarily designed for climate but also serves as the backbone for global operational oceanography. One of the aims of GODAE is to formulate more specific requirements on the basis of improved understanding of data utility Use of OSEs (Observing System Evaluations) or OSSEs (Observing System Simulation Experiments). OSEs are flexible tools as they can be used to examine the impact of observations on a particular application or to give insight into the effectiveness of the data assimilation systems that are being used.

14 Workshop objectives Review work done on impact studies, OSEs and OSSEs over the past years Identify robust and common features Understand differences in assimilation systems Provide good examples of the contribution of observing systems Provide preliminary recommendations on observing system design Define and agree on activities to be carried out before the GODAE final symposium Develop new ideas on the way to assess and design the ocean observing systems and propose new experiments to be carried out in the coming years

15 GODAE-OOPC OSSE/OSE Workshop Over-arching observing system questions: Are there any clear redundancies in the present data set in any particular regions? Are there any clear shortcomings in the present data set that affect your ability to make fit-for-your-purpose outputs? Are there any 'supplemental' data set issues that limit the skill of your outputs, and how severe are the limits? Would any level of improved coverage and/or accuracy add value to you product(s) or is there need for a specific level of improvement?

16 Main topics to be covered during the workshop Observing system assessment and design methodologies: theory, use and limitations Altimetry : impact of one to several altimeters, Mean Dynamic Topography issues Argo (T and/or S) and in-situ observing system (XBT lines, tropical moorings, reference moorings, hydrography, transport monitoring) Sea Surface Temperature/GHRSST- PP Other observing systems (e.g. winds, sea surface salinity, velocity) Synthesis of results, recommendations and work plan for 2008

17 This is a workshop! Leave time for discussion Raise issues and ways to solve them Stimulate discussion

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20 GODAE-OOPC OSE/OSSE Workshop Rapporteurs per session/item (not only) + one transverse session Objectives : summarize discussions, main results, identify main issues and collaborative work to be carried out before the symposium, longer term issues (what needs to be done? how?) => report at the end of the meeting (Wednesday) + write a one or two page summary of session and discussion (by next week!) Meeting with rapporteurs tomorrow evening